Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2008-07-29
2008-07-29
Payne, David C. (Department: 2611)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S229000, C375S316000, C375S240000, C375S232000
Reexamination Certificate
active
07406125
ABSTRACT:
An improved per-tone FEQ method with a noise reduction technique using periodic training pilot tones increases the throughput for long-reached modems. This method can reduce the noise effects in estimating FEQ equalizer coefficients. Each per-tone FEQ can be estimated by using the periodic training signals and an averaging technique to remove noise from each sub-channel (EQN. VI). After solving the system equations (EQN. IV), per-tone equalization coefficients of the FEQ equalizer for each group can be combined to obtain the optimized results in the form of the Toeplitz matrix (EQN. V). Each element within the Toeplitz matrix can be derived from the averaging technique used to remove noise from each sub-channel (EQN. VI). To demodulate a signal with the Toeplitz matrix, an inverse of every element in a row of the Toeplitz matrix is taken and multiplied by the sending signal which creates an N Log N matrix.
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Dholakia Jwalant
Morejon Israel
Zeng Yueping
Jabil Circuit, Inc.
King & Spalding LLP
Payne David C.
Wong Linda
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